Transformer insulation state on-line monitoring device

Abstract

The invention relates to a transformer insulation state on-line monitoring device which comprises an industrial computer, a data acquisition card and a digital I/O card, wherein the data acquisition card and the digital I/O card are arranged on the industrial computer, the digital I/O card is connected with a power management unit, a signal conditioning unit and an amplifier unit are connected with a dielectric loss iron core measuring unit, the data acquisition card is connected with the amplifier unit and the dielectric loss iron core measuring unit, the amplifier unit is connected with the signal conditioning unit, the signal conditioning unit is connected with a local discharge fronting plate, the dielectric loss iron core measuring unit is connected with a dielectric loss iron core fronting plate, the local discharge fronting plate is connected with a large sensor at the bottom of a sleeve and a two-in-one sensor at the tail screen of the sleeve, the dielectric loss iron core fronting plate is connected with the two-in-one sensor at the tail screen of the sleeve and an iron core grounding sensor for sending the acquired signal to the industrial computer for signal polarity identification, digital filtration and anti-interference processing, a local discharge of each phase of a transformer to be measured is computed, discharge times are counted and a discharge tendency chart is generated. The invention has the characteristics of good integrity, high measurement accuracy, simple software operation and capability of remote browsing.

Description

technical field [0001] The invention relates to an on-line monitoring device for the insulation of electric power equipment, in particular to an on-line monitoring device for the insulation state of a transformer. Background technique [0002] The safe operation of power transformers is an important factor affecting the safety, stability and economic operation of power systems. Insulation accidents in power transformers will not only cause damage to the equipment itself, but also cause various losses. The accumulation of insulation faults and aging to a certain extent will cause severe insulation damage or even breakdown, leading to accidents, and will cause heavy losses to the operation of the power system itself and people's production and life. [0003] At present, it is mainly through regular maintenance and insulation preventive tests to prevent the occurrence of power transformer insulation accidents, and at the same time, online monitoring technology for some insulati...

AI Technical Summary

Problems solved by technology

However, the test conditions and operating conditions of the preventive test are different, and the offline test cannot fully reflect the insulation status of the equipment under operating conditions.

Insulation fault itself has a process of occurrence and development, and is related to operating conditions, so it is not easy to accurately find out in regular preventive tests

Both regular maintenance and insulation preventive tests need to be carried out offline after a power outage. The test time is long, the workload is heavy, and it will cause a large amount of power loss and possible equipment damage.

Moreover, the online monitoring of a single parameter cannot completely eliminate accidents, and it is difficult to detect the faults that occur during the operation of the equipment; the products of various online monitoring technology providers do not have unified products and basic technical requirements, and it is difficult to carry out data integration and testing Unified comparative analysis of results

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